Therefore, the ultimate speed of the bearing depends on the type, size and precision of the bearing as well as the lubrication method, the quality and quantity of the lubricant, the material and type of the cage, and the load conditions. The limit speeds of various types of bearings using grease lubrication and oil lubrication (oil bath lubrication) are respectively included in the bearing size table. The values indicate the standard design of the bearing under normal load conditions (C/P>=13, Fa/Fr<= 0.25 or so) The limit value of the rotation speed when rotating downward. In addition, depending on the type and grade of the lubricant, the lubricant may be superior to other properties but not suitable for high-speed rotation.
The corrected load condition of the limit speed C/P<13 (that is, the equivalent dynamic load P exceeds 8% of the basic dynamic load C), or the axial load in the combined combined load exceeds 25% of the radial load. The following formula corrects the limit speed. Na=f1*f2*n where na: corrected limit speed, rpm f1: correction factor f2 related to load conditions: correction factor n related to combined load: limit speed under normal load conditions, rpm (refer to bearing size Table) C: Basic dynamic load rating, N{kgf} P : Equivalent dynamic load, N{kgf} Fr: Radial load, N{kgf} Fa: Axial load, N{kgf} Limit of ball bearing with seal ring Speed limit with contact seal (RS type) Ball bearings are limited by the line speed of the seal contact surface, allowing the line speed to depend on the rubber material of the seal.
Precautions for high-speed rotation When the bearing rotates at a high speed, especially when the speed is close to or exceeds the limit speed stated in the dimension table, the following should be noted:
(1) Using precision bearings
(2) Analyze the internal clearance of the bearing (considering the reduction of the internal clearance of the bearing due to the temperature rise)
(3) Analyze the type of material of the cage (for high-speed rotation, it is suitable to use a copper alloy or phenolic resin cutting cage. There is also a synthetic resin molding cage suitable for high-speed rotation)
(4) Analyze the lubrication method (using the lubrication method suitable for high-speed rotation, such as circulating lubrication, jet lubrication, oil mist lubrication and oil-air lubrication). The friction coefficient of the bearing (reference). In order to facilitate comparison with the sliding bearing, the friction torque of the rolling bearing can be used as the bearing. The inner diameter is calculated by the following formula: M=uPd/2 where M: friction torque, mN.m{kgf.mm} u: friction coefficient, bearing load, N{kgf} d: bearing nominal inner diameter, mm friction coefficient u by bearing type The bearing load, speed, and lubrication method have a great influence.
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